Growth of thick Yba₂Cu₃O_7−δ films carrying a critical current of over 230 A/cm on single LaMnO₃-buffered ion-beam assisted deposition MgO substrates

A single LaMnO₃ buffer layer was developed for the growth of superconducting thick YBa₂Cu₃O_7−δ (YBCO) films on polycrystalline Ni-alloy substrates where a biaxially textured MgO layer, produced by ion-beam assisted deposition (IBAD), was used as a template. Using pulsed laser deposition, a 1.65-μm-thick YBCO film with a critical current density of 1.4 × 10⁶ A/cm² in self field at 75 K was achieved on sputtered LaMnO3-buffered IBAD MgO substrates. This corresponds to a critical current (I_c) of 231 A/cm-width. This result demonstrates the possibility of using both LaMnO₃ buffer and IBAD MgO template for producing high current density YBCO-coated conductors.